Tap



19:45 J. A. E. ROMANOSKI 2,389,548

TAP

Filed March 31, 1944 Inventor Patented Nov. 20, 1945 UNITED STATESPATENT OFFICE TAP Joseph A. E. Romanoski, Huntington, N. Y.

Application March 31, 1944, Serial No. 528,919

1 Claim.

My invention relates to improvements in taps, the principal object inview being to equip the usual tap with a detachable pilot of simple,practical form and whereby in hand tapping the tap may be started andthen' withdrawn and the pilot detached so as not to obstruct tapping ofblind holes to the bottom thereof.

Other and subordinate objects are also comprehended by my invention, allof which, together with the precise nature of my improvements, will bereadily understood when the ucceeding description and claim are readwith reference to the drawing accompanying and forming "part of thisspecification.

In said drawing:

Figure 1 is a view partly in longitudinal section and partly inelevation illustrating a tap equipped according to my invention, and

Fi ure 2 is a view in perspective of the parts of the tap detached,

Referring to the drawing by numerals, according to my invention, theusual tap I with the wrenchor tool engaging end 2 is provided with anaxial bore 3 extending inwardly from the leading end of the tap for asuitable distance beyond the threading portion 4 of the tap. The bore 3is designed to receive with a sliding fit a, pilot spindle 5 designed toextend to the inner end of the bore 3 and to project out of the same fora substantial distance. An Allen type of set screw 6 threaded into thetap I radially beyond the threadingportion 4 of the tap is designed tohear I against a, flattened portion 1 of the spindle 5 adjacent the buttend of the latter and lock said spindle 5 in the bore 3. A pilot sleeve8 is fitted over the extending portion of the spindle 5 and detachablysecured thereto by an Allen type of set screw 9 threaded radially intosaid sleeve and bearing against a flattened portion l0 in the spindle 5adjacent its outer end.

The manner in which the described invention is designed to be used willbe readily understood. In hand tapping a blind hole, the tappingoperation is started with the described pilot attached to the tap, itbeing understood that the pilot sleeve 8 is of the roper diameter ascompared to that The tap l is then withdrawn, the

of the hole. pilot sleeve 8 detached from the spindle 5 by removing theAllen screw 9, and the pilot spindle 5 detached from the tap by removingthe Allen screw 6. The tap is then reinserted in the hole and thetapping operation completed.

The foregoing will, it is believed, suffice to impart a clearunderstanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible of modificationwithout departing from the inventive concept, and right is hereinreserved to such modifications as fall within the scope of the appendedclaim.

What I claim is:

A tap having a threaded end portion and an axial bore extending thereinfrom the leading end thereof and past said portion, a pilot spindleremovably inserted in said bore and having an outer end extending out ofthe same, and a pilot member detachably attached to said end, and a setscrew extending into said tap in the rear of said portion and engagingsaid spindle.

JOSEPH A. E. ROMANOSKI.

